Surgery – Instruments – Electrical application
Patent
1994-12-12
1997-07-01
Sykes, Angela D.
Surgery
Instruments
Electrical application
606 34, 606 42, 607122, 128642, A61B 5004
Patent
active
056432550
ABSTRACT:
A catheter, used e.g. for cardiac ablation, has a handle, a shaft, and a J-bendable distal end containing tip and ring electrodes. The tip electrode is axially rotatable and has insulated and uninsulated portions. As the tip electrode is rotated, the impedance between it and a reference level is observed. When the impedance reaches a maximum, this indicates that the uninsulated portion lies against the tissue and the insulated portion faces the bloodstream. An electrogram can be taken from the electrode, or an ablation current can then be applied to it. Short circuiting of the signal or current through the blood is thus reduced.
REFERENCES:
patent: 4955382 (1990-09-01), Franz et al.
patent: 5125896 (1992-06-01), Hojeibane
patent: 5190050 (1993-03-01), Nitzsche
patent: 5242441 (1993-09-01), Avitall
patent: 5327905 (1994-07-01), Avitall
patent: 5357956 (1994-10-01), Nardella
patent: 5398683 (1995-03-01), Edwards et al.
Leonard T. Blouin and Frank I. Marcus, The Effect of Electrode Design on the Efficiency of Delivery of Radiofrequency Energy to Cardiac Tissue In Vitro, PACE, vol. 12, Jan. 1989, Part II, pp. 136-143.
Hicor, Inc.
Peffley Michael
Sykes Angela D.
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